Its not advisable installing more than one AVS on your phone; there can be conflict between the two AVS's and this can slow down the system of your phone/computer.If its PC, one avs and one firewall is ok.If you're not satisfied with the one installed, it's better you unstall it and download/install another one.

I tried it on my symbian,i first had netqin antivirus i mean which i was using before then tried to install kaspersky and my phone said make sure no other antivirus is installed and netqin is installed but i proceed after make sure no antivirus is installed but after the phone switched off/on itself for like two times then netqin notified there's a virus and netqin switched of the phone and on then it came to normal so i'll keep on with netqin then

I've told you the truth; I think you have sensed something from what l told you then.You need to ask yourself this question:Why was a notification that you should make sure no any other antivirus is installed?There would be conflict between the two AVS's.It's safe to install only one antivirus if you want accurate operation of your AVS.

It was even said that atimes, we dont need antivirus if we can maintain good operation of our devices; except some few devices which cannot stand alone without installing AVS;and that is just because of their sensitivity to virus.

Smadav Is Not Really Sharp In This But I Think Of Kaspersky Cause Smadav Is Much Good In Usb Antivirus And It Really Don't Detect Viruses But It Depends On How You Use Your System Because Antivirus Detects A Virus It's Capable Of And My Brother Uses Smadav And Mc-afee